MSE Seminar: Huang Lin, Laboratory Study of Corrosion of Ag and Cu with Ozone, UV and NaCl

PhD Candidate advised by Dr. Gerald Frankel, Department of Materials Science and Engineering, The Ohio State University

Abstract

Ag and Cu have been used as corrosivity monitors in field. This makes it important to understand their corrosion behavior in field. To achieve this goal, two home-built environment chambers were used for exposure of Ag and Cu with ozone, UV and NaCl. Corrosion products were analyzed by XRD and electrochemically quantified by calibrated and modified coulometric reduction technique. Effects of ozone, UV, relative humidity and NaCl were fully studied. It is determined that effect of UV on Ag is a combination of accelerating and decelerating effects, and a strong interaction between Cu and UV doubles corrosion rate of Cu. Relative humidity is critical in determination of  composition of corrosion products of Ag other than affect corrosion rate. This laboratory study is not only useful in understanding corrosion behavior of Ag and Cu in field, but also generates many helpful results in predicting their corrosion behavior in field, such as predicting corrosion rate and composition of corrosion products.

Corrosion behavior of Ag with NaCl solution was also further studied by potentiodynamic polarization and linear polarization tests. It is  determined that corrosion current density of Ag in NaCl is very low, less than 10-7 A/cm2, while exchange current density of Ag in NaCl can reach up to 10-4 A/cm2. This result is very helpful for understanding corrosion behavior of Ag in salt spray chamber during ASTM B117 test.

Bio

I have been study Materials Science for about 11 years, a long period, and earned my Bachelor and Master degrees in China. Right now I am fighting through the end of my student career to earn my doctoral degree. I like watching sports. My favorite sports were basketball, soccer, tennis before I came to United States and now, football is certainly my NO 1.